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The two road-speed units and how to convert between them.
60 mph and 97 km/h describe the same speed — the number differs only because the distance unit differs. One mile is 1.60934 km, so 1 mph = 1.60934 km/h, and 1 km/h = 0.621371 mph.
To estimate km/h from mph, multiply by 1.6. To estimate mph from km/h, take about 62% (or multiply by 0.62). These get you within a few percent for everyday use.
| mph | km/h |
|---|---|
| 30 | 48 |
| 50 | 80 |
| 65 | 105 |
| 70 | 113 |
| 100 | 161 |
Because cars are sold globally, dual speedometers let drivers read the limit in any country. Digital speedometers often switch units with a setting.
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